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arXiv 0903.2404cond-mat.mtrl-sci
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强磁场中量子级联laser的光学声子散射和磁极化子理论

Optical phonon scattering and theory of magneto-polarons in a quantum cascade laser in a strong magnetic field

Yu Chen, N. Regnault, R. Ferreira, Bang-Fen Zhu, G. Bastard

摘要:

本文对强磁场作用下量子级联激光器中的载流子弛豫进行了理论研究。合金(GaInAs)的无序效应和Frohlich相互作用时,考虑到电子的能量差被调谐到纵向光学(LO)声子能量。在弱的电子-声子耦合制度,费米的黄金法则计算的LO声子散射率显示了一个非常快的非辐射弛豫通道的合金加宽朗道能级(LL的)。在强的电子-声子耦合制度,我们使用磁极化子形式主义和计算电子的生存概率在上LL的包括大量的合金无序配置的LO声子模式的数量增加。我们的研究结果预测了一个非指数衰减的上层人口一旦电子注入在这种状态。

英文摘要:

We report a theoretical study of the carrier relaxation in a quantum cascade laser (QCL) subjected to a strong magnetic field. Both the alloy (GaInAs) disorder effects and the Frohlich interaction are taken into account when the electron energy differences are tuned to the longitudinal optical (LO) phonon energy. In the weak electron-phonon coupling regime, a Fermi's golden rule computation of LO phonon scattering rates shows a very fast non-radiative relaxation channel for the alloy broadened Landau levels (LL's). In the strong electron-phonon coupling regime, we use a magneto-polaron formalism and compute the electron survival probabilities in the upper LL's with including increasing numbers of LO phonon modes for a large number of alloy disorder configurations. Our results predict a nonexponential decay of the upper level population once electrons are injected in this state.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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